package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aopalliance.intercept.Joinpoint;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut() {
    }

    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinpoint) {
        log.info("开始公共字段自动填充...");
        // 1.获取操作类型
        MethodSignature signature = (MethodSignature) joinpoint.getSignature();// 方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);// 方法上的注解对象
        OperationType value = autoFill.value(); // 注解的值
        // 2.获取到方法参数
        Object[] args = joinpoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object arg = args[0];
        // 3.准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        // 4.字段填充
        if (value == OperationType.INSERT) {
            try {
                Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                // 通过反射进行赋值
                setCreateTime.invoke(arg, now);
                setUpdateTime.invoke(arg, now);
                setCreateUser.invoke(arg, currentId);
                setUpdateUser.invoke(arg, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (value == OperationType.UPDATE) {
            try {
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(arg, now);
                setUpdateUser.invoke(arg, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }

}
